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Doesn't matter what the world was like (existing with meaning or without) before humans climbed aboard ... as soon as humans entered the scene, the world became a meaningful existence, because all of our behaviour/actions/laws, rules set up prove that.
That, in a nutshell, is the egotism of religion. It's not about god, it's about human beings. Mankind is the ultimate measure. Without Man, the universe is meaningless. Only with human beings crawling around a tiny orb in a backwoods neighborhood of an average galaxy, does the whole vast shebang become important.
It's infantile, really, the me-centered world view of a toddler.